The "Mist Maker" underwater LED pond light puck creates both color lighting effects and mist in a single light fixture. x12 colored LED diodes occupy the outer ring of the puck and automatically cycles through animated lighting effects to create a dynamic underwater fountain light show. A ceramic disk located in the center of the puck, which oscillates at ultrasonic frequencies to produce mist or light fog. The misting function on the DH-24 improves air quality by freshening the air and acting as a passive humidifier. Add a drop of scented oil and the "Mist Maker" will diffuse the scent into the air, making the entire room radiate wonderful fragrance. Included with the submersible LED puck is a UL listed 24V plug-in transformer, with 6' of attached cabling. Make sure to place the transformer inside a waterproof cover box for outside applications.Please note when using the DH-24, only tap water is required! Pure or distilled water does not register on the automatic shut-off sensor which turns off the fixture in the even of low water levels. If used while not submerged, the risk of burn out is extremely high. Make sure the water is at least 2cm (3/4") above the water sensor bar (the black arch located on the puck).